The girl group will bank an initial £150,000 advance from their £1 million record deal with Simon Cowell's Syco label, which they received as part of their winner's contract.
However, Cowell believes they can be marketed to become as big as the Spice Girls and has an array of gigs and deals lined up for the pop four-piece, reports The Sun.
Little Mix could bag endorsements with haircare product brands, clothing manufacturers and beauty firms, as well as charging £50,000 a time for corporate gigs.
Cowell also plans to secure Little Mix a US deal as he thinks they can be the next big thing.
A source said: "Offers have been coming in for weeks now. People in marketing spend their lives looking for suitable role models. Little Mix are the full package. The trick will be knowing what to turn down."
Cowell has enlisted songwriter Richard 'Biff' Stannard to work with the girls. Stannard is responsible for the Spice Girls' breakout hit 'Wannabe'.
Gary Barlow and Savan Kotecha have also been hired to work on the group's debut album.
The source added: "Simon has made no bones of the fact that he wants the best writers on board. He genuinely thinks the girls can be as big as - if not bigger than - the Spice Girls."
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Watch Little Mix perform their X Factor winner's single below: